Abstract
Purpose
In various cancer types, an abundance of FoxP3+ regulatory T cells (Treg) has been associated with an unfavorable outcome. Yet, the role of Treg on cancer immunity has been shown to be complex. In single cell marker technique, other tumor-infiltrating lymphocytes (TILs) such as cytotoxic CD8+ T cells (CTL) also influenced prognosis. This study for the first time investigates the concurrent spatial distribution pattern of CD8+ and FoxP3+ TILs and their prognostic impact in human gastric cancer.
Materials and methods
Tumor tissue microarrays of 50 patients with surgically treated adenocarcinoma of the cardia were studied. An immunohistochemical double staining of CD8+ and FoxP3+ TILs was performed. Cell counts and cell-to-cell distances in tumor epithelium and stroma were evaluated with image-processing software. Metastasis-free survival, no-evidence-of-disease survival, and overall survival were investigated (mean follow-up time 6.9 years).
Results
High intraepithelial infiltration of CD8+ and FoxP3+ TIL was associated with the improved 10-year metastasis-free survival (83 vs. 54 %, p = 0.04 and 85 vs. 59 %, p = 0.09, respectively). Considering cell-to-cell distance and comparing patients with functional (30–110 μm) versus nonfunctional distances of CD8+ and FoxP3+ TILs, 10-year survival rates differed between 89 and 55 % (p = 0.009), respectively.
Conclusion
Prognostic influence of tumor-infiltrating immune cells in gastric cancer critically depends on their cell-to-cell distance. FoxP3+ TILs must be located within a distance between 30 and 110 μm of CD8+ T cells to positively impact on prognosis.
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We thank Christa Winkelmann for excellent technical assistance.
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The authors declare that they have no conflict of interest.
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Anita Feichtenbeiner and Matthias Haas have contributed equally to this work.
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Feichtenbeiner, A., Haas, M., Büttner, M. et al. Critical role of spatial interaction between CD8+ and Foxp3+ cells in human gastric cancer: the distance matters. Cancer Immunol Immunother 63, 111–119 (2014). https://doi.org/10.1007/s00262-013-1491-x
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DOI: https://doi.org/10.1007/s00262-013-1491-x